1. TURN OFF CEL This MS309 car diagnostic tool supports Reading DTCs, displaying Live Data, Freeze Frame I/M Readiness etc to figure out the root cause of the Check Engine Light (CEL) and turning it off, to help you detect any potential problems, and to avoid excessive costs for unnecessary repairs. 2. EXTENSIVE APPLICATION Autel MS309 Compatible with 7 languages (English, French, Spanish, etc.) and various post1996 OBD II protocol vehicles (Toyota, Nissan, Honda, Ford, etc.), this OBD II scanner provides accurate and fast diagnosis for worldwide car owners. 3. FOR END USER DIYERS This error code reader MS309 is 'plug and play' and comes with an easy interface. Even if you're not familiar with vehicle repair, you can quickly take control of this obd2 scanner, and get the information you want. 4. USERFRIENDLY DESIGN This check engine code reader features a patented OneClick I/M Readiness Key, TFT color display, builtin speaker, LED Indicator etc. The cable is long enough without being too long and getting in the way. No batteries are needed.